Well if I had "plane trouble" and a broken plane on the runway on my solo - i'd consider a new hobby! Seriously, with 0 pressure it would just be case of declaring a mayday and getting down in the airfield boundary! prefereably on a clear runway, failing that over/behind the aircraft on the main runway, failing that somewhere clear of stuff on the field itself.
I had a plane with an engine failure during my 1st solo, fortunatly I was on the ramp still, so just waited well the guy force landed onto the main runway (lucky git!)
If my plane was fine, and there was a broken one on the runway, I guess It'd be a case of leaving the circuit and holding somewhere, gogo juice permitting